Mercurial > hg
annotate contrib/python-zstandard/c-ext/compressionwriter.c @ 31266:8089de5fab89
dispatch: add pagination of two more help cases
I missed these in the last round anf Yuya spotted them in
review. Thanks!
author | Augie Fackler <augie@google.com> |
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date | Wed, 08 Mar 2017 18:32:42 -0500 |
parents | c32454d69b85 |
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1 /** |
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2 * Copyright (c) 2016-present, Gregory Szorc |
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3 * All rights reserved. |
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4 * |
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5 * This software may be modified and distributed under the terms |
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6 * of the BSD license. See the LICENSE file for details. |
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7 */ |
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8 |
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9 #include "python-zstandard.h" |
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10 |
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11 extern PyObject* ZstdError; |
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12 |
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13 PyDoc_STRVAR(ZstdCompresssionWriter__doc__, |
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14 """A context manager used for writing compressed output to a writer.\n" |
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15 ); |
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16 |
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17 static void ZstdCompressionWriter_dealloc(ZstdCompressionWriter* self) { |
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18 Py_XDECREF(self->compressor); |
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19 Py_XDECREF(self->writer); |
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20 |
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21 if (self->cstream) { |
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22 ZSTD_freeCStream(self->cstream); |
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23 self->cstream = NULL; |
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24 } |
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25 |
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26 PyObject_Del(self); |
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27 } |
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28 |
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29 static PyObject* ZstdCompressionWriter_enter(ZstdCompressionWriter* self) { |
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30 if (self->entered) { |
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31 PyErr_SetString(ZstdError, "cannot __enter__ multiple times"); |
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32 return NULL; |
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33 } |
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34 |
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35 self->cstream = CStream_from_ZstdCompressor(self->compressor, self->sourceSize); |
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36 if (!self->cstream) { |
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37 return NULL; |
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38 } |
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39 |
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40 self->entered = 1; |
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41 |
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42 Py_INCREF(self); |
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43 return (PyObject*)self; |
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44 } |
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45 |
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46 static PyObject* ZstdCompressionWriter_exit(ZstdCompressionWriter* self, PyObject* args) { |
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47 PyObject* exc_type; |
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48 PyObject* exc_value; |
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49 PyObject* exc_tb; |
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50 size_t zresult; |
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51 |
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52 ZSTD_outBuffer output; |
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53 PyObject* res; |
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54 |
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55 if (!PyArg_ParseTuple(args, "OOO:__exit__", &exc_type, &exc_value, &exc_tb)) { |
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56 return NULL; |
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57 } |
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58 |
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59 self->entered = 0; |
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60 |
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61 if (self->cstream && exc_type == Py_None && exc_value == Py_None && |
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62 exc_tb == Py_None) { |
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63 |
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64 output.dst = PyMem_Malloc(self->outSize); |
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65 if (!output.dst) { |
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66 return PyErr_NoMemory(); |
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67 } |
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68 output.size = self->outSize; |
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69 output.pos = 0; |
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70 |
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71 while (1) { |
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72 zresult = ZSTD_endStream(self->cstream, &output); |
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73 if (ZSTD_isError(zresult)) { |
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74 PyErr_Format(ZstdError, "error ending compression stream: %s", |
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75 ZSTD_getErrorName(zresult)); |
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76 PyMem_Free(output.dst); |
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77 return NULL; |
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78 } |
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79 |
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80 if (output.pos) { |
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81 #if PY_MAJOR_VERSION >= 3 |
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82 res = PyObject_CallMethod(self->writer, "write", "y#", |
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83 #else |
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84 res = PyObject_CallMethod(self->writer, "write", "s#", |
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85 #endif |
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86 output.dst, output.pos); |
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87 Py_XDECREF(res); |
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88 } |
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89 |
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90 if (!zresult) { |
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91 break; |
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92 } |
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93 |
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94 output.pos = 0; |
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95 } |
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96 |
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97 PyMem_Free(output.dst); |
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98 ZSTD_freeCStream(self->cstream); |
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99 self->cstream = NULL; |
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100 } |
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101 |
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102 Py_RETURN_FALSE; |
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103 } |
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104 |
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105 static PyObject* ZstdCompressionWriter_memory_size(ZstdCompressionWriter* self) { |
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106 if (!self->cstream) { |
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107 PyErr_SetString(ZstdError, "cannot determine size of an inactive compressor; " |
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108 "call when a context manager is active"); |
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109 return NULL; |
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110 } |
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111 |
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112 return PyLong_FromSize_t(ZSTD_sizeof_CStream(self->cstream)); |
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113 } |
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114 |
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115 static PyObject* ZstdCompressionWriter_write(ZstdCompressionWriter* self, PyObject* args) { |
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116 const char* source; |
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117 Py_ssize_t sourceSize; |
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118 size_t zresult; |
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119 ZSTD_inBuffer input; |
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120 ZSTD_outBuffer output; |
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121 PyObject* res; |
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122 Py_ssize_t totalWrite = 0; |
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123 |
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124 #if PY_MAJOR_VERSION >= 3 |
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125 if (!PyArg_ParseTuple(args, "y#:write", &source, &sourceSize)) { |
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126 #else |
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127 if (!PyArg_ParseTuple(args, "s#:write", &source, &sourceSize)) { |
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128 #endif |
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129 return NULL; |
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130 } |
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131 |
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132 if (!self->entered) { |
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133 PyErr_SetString(ZstdError, "compress must be called from an active context manager"); |
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134 return NULL; |
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135 } |
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136 |
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137 output.dst = PyMem_Malloc(self->outSize); |
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138 if (!output.dst) { |
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139 return PyErr_NoMemory(); |
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140 } |
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141 output.size = self->outSize; |
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142 output.pos = 0; |
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143 |
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144 input.src = source; |
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145 input.size = sourceSize; |
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146 input.pos = 0; |
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147 |
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148 while ((ssize_t)input.pos < sourceSize) { |
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149 Py_BEGIN_ALLOW_THREADS |
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150 zresult = ZSTD_compressStream(self->cstream, &output, &input); |
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151 Py_END_ALLOW_THREADS |
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152 |
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153 if (ZSTD_isError(zresult)) { |
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154 PyMem_Free(output.dst); |
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155 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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156 return NULL; |
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157 } |
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158 |
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159 /* Copy data from output buffer to writer. */ |
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160 if (output.pos) { |
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161 #if PY_MAJOR_VERSION >= 3 |
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162 res = PyObject_CallMethod(self->writer, "write", "y#", |
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163 #else |
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164 res = PyObject_CallMethod(self->writer, "write", "s#", |
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165 #endif |
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166 output.dst, output.pos); |
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167 Py_XDECREF(res); |
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168 totalWrite += output.pos; |
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169 } |
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170 output.pos = 0; |
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171 } |
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172 |
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173 PyMem_Free(output.dst); |
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174 |
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175 return PyLong_FromSsize_t(totalWrite); |
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176 } |
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177 |
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178 static PyObject* ZstdCompressionWriter_flush(ZstdCompressionWriter* self, PyObject* args) { |
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179 size_t zresult; |
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180 ZSTD_outBuffer output; |
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181 PyObject* res; |
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182 Py_ssize_t totalWrite = 0; |
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183 |
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184 if (!self->entered) { |
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185 PyErr_SetString(ZstdError, "flush must be called from an active context manager"); |
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186 return NULL; |
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187 } |
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188 |
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189 output.dst = PyMem_Malloc(self->outSize); |
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190 if (!output.dst) { |
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191 return PyErr_NoMemory(); |
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192 } |
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193 output.size = self->outSize; |
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194 output.pos = 0; |
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195 |
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196 while (1) { |
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197 Py_BEGIN_ALLOW_THREADS |
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198 zresult = ZSTD_flushStream(self->cstream, &output); |
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199 Py_END_ALLOW_THREADS |
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200 |
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201 if (ZSTD_isError(zresult)) { |
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202 PyMem_Free(output.dst); |
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203 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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204 return NULL; |
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205 } |
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206 |
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207 if (!output.pos) { |
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208 break; |
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209 } |
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210 |
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211 /* Copy data from output buffer to writer. */ |
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212 if (output.pos) { |
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213 #if PY_MAJOR_VERSION >= 3 |
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214 res = PyObject_CallMethod(self->writer, "write", "y#", |
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215 #else |
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216 res = PyObject_CallMethod(self->writer, "write", "s#", |
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217 #endif |
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218 output.dst, output.pos); |
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|
219 Py_XDECREF(res); |
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220 totalWrite += output.pos; |
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221 } |
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222 output.pos = 0; |
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223 } |
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224 |
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225 PyMem_Free(output.dst); |
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226 |
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227 return PyLong_FromSsize_t(totalWrite); |
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228 } |
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229 |
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|
230 static PyMethodDef ZstdCompressionWriter_methods[] = { |
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231 { "__enter__", (PyCFunction)ZstdCompressionWriter_enter, METH_NOARGS, |
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|
232 PyDoc_STR("Enter a compression context.") }, |
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233 { "__exit__", (PyCFunction)ZstdCompressionWriter_exit, METH_VARARGS, |
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|
234 PyDoc_STR("Exit a compression context.") }, |
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|
235 { "memory_size", (PyCFunction)ZstdCompressionWriter_memory_size, METH_NOARGS, |
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|
236 PyDoc_STR("Obtain the memory size of the underlying compressor") }, |
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|
237 { "write", (PyCFunction)ZstdCompressionWriter_write, METH_VARARGS, |
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238 PyDoc_STR("Compress data") }, |
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239 { "flush", (PyCFunction)ZstdCompressionWriter_flush, METH_NOARGS, |
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240 PyDoc_STR("Flush data and finish a zstd frame") }, |
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241 { NULL, NULL } |
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242 }; |
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243 |
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244 PyTypeObject ZstdCompressionWriterType = { |
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245 PyVarObject_HEAD_INIT(NULL, 0) |
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246 "zstd.ZstdCompressionWriter", /* tp_name */ |
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247 sizeof(ZstdCompressionWriter), /* tp_basicsize */ |
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248 0, /* tp_itemsize */ |
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249 (destructor)ZstdCompressionWriter_dealloc, /* tp_dealloc */ |
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250 0, /* tp_print */ |
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251 0, /* tp_getattr */ |
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252 0, /* tp_setattr */ |
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253 0, /* tp_compare */ |
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254 0, /* tp_repr */ |
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255 0, /* tp_as_number */ |
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256 0, /* tp_as_sequence */ |
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257 0, /* tp_as_mapping */ |
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258 0, /* tp_hash */ |
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259 0, /* tp_call */ |
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260 0, /* tp_str */ |
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261 0, /* tp_getattro */ |
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262 0, /* tp_setattro */ |
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263 0, /* tp_as_buffer */ |
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264 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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265 ZstdCompresssionWriter__doc__, /* tp_doc */ |
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266 0, /* tp_traverse */ |
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267 0, /* tp_clear */ |
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268 0, /* tp_richcompare */ |
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269 0, /* tp_weaklistoffset */ |
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270 0, /* tp_iter */ |
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271 0, /* tp_iternext */ |
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272 ZstdCompressionWriter_methods, /* tp_methods */ |
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273 0, /* tp_members */ |
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274 0, /* tp_getset */ |
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275 0, /* tp_base */ |
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276 0, /* tp_dict */ |
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277 0, /* tp_descr_get */ |
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278 0, /* tp_descr_set */ |
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279 0, /* tp_dictoffset */ |
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280 0, /* tp_init */ |
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281 0, /* tp_alloc */ |
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282 PyType_GenericNew, /* tp_new */ |
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283 }; |
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284 |
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285 void compressionwriter_module_init(PyObject* mod) { |
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286 Py_TYPE(&ZstdCompressionWriterType) = &PyType_Type; |
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287 if (PyType_Ready(&ZstdCompressionWriterType) < 0) { |
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288 return; |
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289 } |
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290 } |